<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>页面3</title>
	<button id="go">返回</button>
</head>
<body>
	
</body>
</html>
<script>
	var goBtn = document.getElementById("go");
	goBtn.onclick = function(){
		//后退两个页面
		history.go(-2);
	};
</script>